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Theory and design of radio frequency...

Fujita, Hiroyuki.

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Theory and design of radio frequency coils in magnetic resonance imaging.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Theory and design of radio frequency coils in magnetic resonance imaging./
作者:	Fujita, Hiroyuki.
面頁冊數:	178 p.
附註:	Co-Advisers: Robert W. Brown; Shmaryu M. Shvartsman.
Contained By:	Dissertation Abstracts International59-05B.
標題:	Engineering, Biomedical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9833882
ISBN:	0591871890

Theory and design of radio frequency coils in magnetic resonance imaging.
Fujita, Hiroyuki.

Theory and design of radio frequency coils in magnetic resonance imaging. - 178 p.

Co-Advisers: Robert W. Brown; Shmaryu M. Shvartsman.

Thesis (Ph.D.)--Case Western Reserve University, 1998.

Advances in Magnetic Resonance Imaging (MRI) depend upon the performance of the available hardware that include radio frequency (rf) coils. The rf coils are used in MRI system to transmit rf electromagnetic waves to flip proton intrinsic angular momenta (spins) from their original direction along the applied external static magnetic field and detect (or receive) their signals when the precessing spins relax back to that original direction.

ISBN: 0591871890Subjects--Topical Terms:

1017684
Engineering, Biomedical.

Theory and design of radio frequency coils in magnetic resonance imaging.
LDR:03295nam 2200313 a 45 001 934604
005 20110509
008 110509s1998 eng d
020 $a 0591871890
035 $a (UnM)AAI9833882
035 $a AAI9833882
040 $a UnM $c UnM
100 1 $a Fujita, Hiroyuki. $3 894255
245 1 0 $a Theory and design of radio frequency coils in magnetic resonance imaging.
300 $a 178 p.
500 $a Co-Advisers: Robert W. Brown; Shmaryu M. Shvartsman.
500 $a Source: Dissertation Abstracts International, Volume: 59-05, Section: B, page: 2263.
502 $a Thesis (Ph.D.)--Case Western Reserve University, 1998.
520 $a Advances in Magnetic Resonance Imaging (MRI) depend upon the performance of the available hardware that include radio frequency (rf) coils. The rf coils are used in MRI system to transmit rf electromagnetic waves to flip proton intrinsic angular momenta (spins) from their original direction along the applied external static magnetic field and detect (or receive) their signals when the precessing spins relax back to that original direction.
520 $a There exists a variety of rf coils depending upon applications of interest. Uniformity of the field produced by the rf coils and the higher field sensitivity are commonly demanded for preferred rf coil performances. On the other hand, it has been difficult to theoretically analyze properties of rf coils that have complicated geometries, but it is essential to understand how the coils perform prior to manufacturing.
520 $a We have developed a method of moments to evaluate rf coil properties and implemented a set of numerical codes for analyzing the rf coils. Utilizing these tools, various coil structures, including circular and rectangular loops, birdcage coils with and without rf shields, half-birdcage coils and others, have been analyzed. The methodology can be applied to any rf coil geometry without limitation. Noteworthy is a novel patented hybrid technique, which has been developed by us, of the target field approach and the method of moments. With this technique, an optimized non-obvious rf coil current pattern is derived, satisfying a set of field constraints and rf coil properties. Thus a prototype coil can be virtually built within the framework of theoretical modeling, eliminating the need for trial-and-error laboratory work (virtual engineering). Such a coil has been built and tested, yielding good agreement with the analysis made by the method of moments. Another remarkable example is an open quadrature rf surface coil, which has been optimized with respect to the current distribution to yield two orthogonal magnetic field distributions leading to quadrature capability. A prototype coil has been constructed, and its performance has been compared with the theoretical results, verifying the validity of the modeling. Images have been obtained employing the prototype coil, showing excellent agreement with the calculated results.
590 $a School code: 0042.
650 4 $a Engineering, Biomedical. $3 1017684
650 4 $a Physics, Electricity and Magnetism. $3 1019535
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710 2 0 $a Case Western Reserve University. $3 1017714
773 0 $t Dissertation Abstracts International $g 59-05B.
790 $a 0042
790 1 0 $a Brown, Robert W., $e advisor
790 1 0 $a Shvartsman, Shmaryu M., $e advisor
791 $a Ph.D.
792 $a 1998
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9833882